TheGCD of two numbers is7 and their LCM is140.If one of the numbers is 20 find the other number

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.